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New install, old IP doesn't pull
by
RustyCaddy
on 05 Jul, 2016 12:26
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Anyone have a general rule of thumb for just how much cranking the engine is too much when trying out a IP of unknown history. Damaged a NA pump with bad biodiesel (refuses to rev; need to tear down for a post-mortum) and all i have on the shelf is a turbo pump. Installed the pump with a clear fuel filter right in front. Cranking it 10-12 seconds at a time and doesn't seem to pull any fuel. Do the pumps ever suddenly catch; the reseals i have done usually pull pretty quickly but with the turbo pump i haven't been able to fill the pump from the top or prime it using the out bolt like with a NA.
Any advice is greatly appreciated. Thanks!
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#1
by
ORCoaster
on 05 Jul, 2016 12:42
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I would think that without any fuel in the IP there will not be any draw of fuel into the pump. Why is it that you can't prefill it? Not having a turbo pump I am unfamiliar why the out bolt method is not working. Can you get it mostly full at the inbolt?
Can you pull diesel into it using a vacuum pump? From the Out Bolt?
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#2
by
libbydiesel
on 05 Jul, 2016 12:42
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Pull a vacuum through it until fuel comes out the return.
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#3
by
ORCoaster
on 05 Jul, 2016 18:20
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Standard Operating Practice, or so I thought.
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#4
by
libbydiesel
on 05 Jul, 2016 19:30
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It's always seemed like the easy way to me. Cue Dkd to tell everyone how stupid they are for priming the fuel system and how he's been getting along just fine for 20 years with just tipping his car upside down instead.
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#5
by
RabbitJockey
on 05 Jul, 2016 20:02
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i can usually get them started just from tipping them on the side.
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#6
by
RustyCaddy
on 06 Jul, 2016 06:33
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Thanks for the advice everyone.
The pump looks full at the inlet fitting but drops down a bit when i crank the motor; the outlet is set on the side under the LDA so it doesn't want to fill easy like the NA pumps. The stored fuel looked good and clear.
i tried to prime it with just a priming bulb at the out bolt but wasn't having luck; will give it another try. If that doesn't work i also have a low pressure pump somewhere, will dig that up and hook it up to the inlet side and try both the pump and priming bulb.
Failing that will go out a get a proper vacuum pump (more $).
And of course there is the all together at once priming bulb, vacuum pump, low pressure pump and dead lifting the motor in the truck to eye level on the drivers side method
Followed by resealing the old pump and reinstalling.
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#7
by
westcoaster
on 07 Jul, 2016 14:44
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Dumb question....
Is the fuel stop solenoid connected and working?
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#8
by
libbydiesel
on 07 Jul, 2016 16:04
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He says in his initial post that he has clear line before the pump and no fuel is being pulled into the pump. The stop solenoid stops fuel flow to the high pressure portion of the pump but leaves the flow to and from the pump unaffected.
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#9
by
westcoaster
on 07 Jul, 2016 17:14
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He says in his initial post that he has clear line before the pump and no fuel is being pulled into the pump. The stop solenoid stops fuel flow to the high pressure portion of the pump but leaves the flow to and from the pump unaffected.
Thanks!
I didn't know where or how that solenoid stopped the flow...
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#10
by
fatmobile
on 12 Jul, 2016 14:58
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Sooo the pump won't pull fuel,.. and when you try using a primer bulb on the outlet it won't pull fuel either?
Maybe the "OUT" bolt restrictor is plugged.
Sometimes it's a good idea to put a regular banjo bolt in the output of the pump if it hasn't run in awhile,.. it doesn't restrict flow. It's just a test, don't drive it that way.
I had a pump that wouldn't even push/pull fuel without the restrictor.
Installing an electric pump allowed me to rev it high enough that at least some of the vanes popped out and it started pulling fuel again.
Your results may vary.
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#11
by
RustyCaddy
on 13 Jul, 2016 11:08
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Fatmobile - that is a great idea. i switched the out bolt with a spare in bolt. With Libby and ORcoasters suggestion of the heavy hammer of a vacuum pump i bought a cheap vacuum pump from harbor freight (with 20% off discount). Hooked up the pump and could see that the sight glass in front of the injection pump begin to fill. kept the pump going for about 8 minutes but never got fuel out. So i know the pump was pulling vacuum but am really surprised that at 8 minutes there was no fuel at the injection pump out bolt. Turned the pump off and could see that air was leaving the pump and heading back into the sight glass. Don't have a vacuum gauge hooked up so think i had better try that. Really weird. Might just have to give up on this injection pump so i can have a dd again (wife is unhappy with my using her car).
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#12
by
sgnimj96
on 16 Jul, 2016 07:18
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is your fuel line to the tank clogged? Disconnect the rubber hose going to the tank, and blow compressed air into the other end that connects to the fuel filter.
I had that problem before from rust in the tank getting lodged in the metal fuel line. Had to blow out the line, then replaced the tank (30+ years old).
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#13
by
RustyCaddy
on 16 Jul, 2016 11:42
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The fuel line looks good but i will keep an eye on that. Drew fuel from the tank through the filter housing and it seemed unobstructed.
Sort of figured out what might have been the problem. Ran the vacuum pump connected to the outbolt for about 10 minutes and finally got some fuel. Once the vacuum was off could see air moving out of the pump and back into the fuel line. Let it sit over night and had a big puddle of diesel below the IP. So the input shaft seal was leaking and the vacuum pump was likely pulling a good bit of air through the IP.
Going to replace the input seal without opening the pump and see if that helps.
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#14
by
vanbcguy
on 31 Jul, 2016 12:07
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Definitely worth a try but be aware that it is not uncommon for the shaft bushing to be on its way out which in turn causes the seal to leak. Usually this happens as a symptom of an overly tight timing belt. If the new seal doesn't last all that long that'll be the culprit. Check how much play the shaft has.
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